Free GRE Practice Question

Question 1 of 1
ID: GRE-SMQ-018
Section: GRE Quantitative Reasoning - Multiple Choice with one or more answer
Topic: Word Problems
Difficulty level: Hard

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A locomotive travels at a maximum speed of \(40\) miles per hour when it is pulling no railcars. When railcars are attached, its speed decreases by an amount proportional to the square of the number of railcars attached. While pulling \(4\) railcars, its speed is \(24\) miles per hour. For which of the following numbers of railcars is the locomotive still able to move — that is, its speed remains greater than \(0\) miles per hour?

Indicate all such numbers.

[ Note: Select one or more answer choices ]

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